/*
 This source file is part of the Swift.org open source project

 Copyright (c) 2021-2023 Apple Inc. and the Swift project authors
 Licensed under Apache License v2.0 with Runtime Library Exception

 See https://swift.org/LICENSE.txt for license information
 See https://swift.org/CONTRIBUTORS.txt for Swift project authors
*/

import XCTest

@testable import Markdown

class LinkTests: XCTestCase {
  func testLinkDestination() {
    let destination = "destination"
    let link = Link(destination: destination)
    XCTAssertEqual(destination, link.destination)
    XCTAssertEqual(0, link.childCount)

    let newDestination = "newdestination"
    var newLink = link
    newLink.destination = newDestination
    XCTAssertEqual(newDestination, newLink.destination)
    XCTAssertFalse(link.isIdentical(to: newLink))
  }

  func testLinkFromSequence() {
    let children = [Text("Hello, world!")]
    let link = Link(destination: "destination", children)
    let expectedDump = """
      Link destination: "destination"
      └─ Text "Hello, world!"
      """
    XCTAssertEqual(expectedDump, link.debugDescription())
  }

  func testAutoLink() {
    let children = [Text("example.com")]
    var link = Link(destination: "example.com", children)
    let expectedDump = """
      Link destination: "example.com"
      └─ Text "example.com"
      """
    XCTAssertEqual(expectedDump, link.debugDescription())
    XCTAssertTrue(link.isAutolink)

    link.destination = "test.example.com"
    XCTAssertFalse(link.isAutolink)
  }

  func testTitleLink() throws {
    let markdown = #"""
      [Example](example.com "The example title")
      [Example2](example2.com)
      [Example3]()
      """#

    let document = Document(parsing: markdown)
    XCTAssertEqual(document.childCount, 1)
    let paragraph = try XCTUnwrap(document.child(at: 0) as? Paragraph)
    XCTAssertEqual(paragraph.childCount, 5)

    XCTAssertTrue(paragraph.child(at: 1) is SoftBreak)
    XCTAssertTrue(paragraph.child(at: 3) is SoftBreak)
    let linkWithTitle = try XCTUnwrap(paragraph.child(at: 0) as? Link)
    let linkWithoutTitle = try XCTUnwrap(paragraph.child(at: 2) as? Link)
    let linkWithoutDestination = try XCTUnwrap(paragraph.child(at: 4) as? Link)

    XCTAssertEqual(try XCTUnwrap(linkWithTitle.child(at: 0) as? Text).string, "Example")
    XCTAssertEqual(linkWithTitle.destination, "example.com")
    XCTAssertEqual(linkWithTitle.title, "The example title")

    XCTAssertEqual(try XCTUnwrap(linkWithoutTitle.child(at: 0) as? Text).string, "Example2")
    XCTAssertEqual(linkWithoutTitle.destination, "example2.com")
    XCTAssertEqual(linkWithoutTitle.title, nil)

    XCTAssertEqual(try XCTUnwrap(linkWithoutDestination.child(at: 0) as? Text).string, "Example3")
    XCTAssertEqual(linkWithoutDestination.destination, nil)
    XCTAssertEqual(linkWithoutDestination.title, nil)
  }
}
